[ZODB-Dev] Re: [Bug] ZODB invalidation processing

[Tres Seaver]

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Joachim Schmitz wrote:
>>> Any suggestion for a temporary fix would be very welcome, since we get 
>>> about 6000 conflict errors per day now about 15 % unresolved, and they 
>>> are really killing our portal.
>> A workaround might be to replace the DateIndexes for 'created' and
>> 'modified' with FieldIndexes:  you will see a big jump in the number of
>> keys in the index, but (perhaps) a reduction in conflicts (altheough
>> there will be more bucket splits, which can also cause conflicts).
>>
> Unfortunately that does not work the FieldIndex also gives an conflict-error
> <FieldIndex at Date>
> <Products.ZCatalog.Catalog.Catalog object at 0xb250a6ec>
> <CatalogTool at portal_catalog>
> <CPSDefaultSite at uniben>
> <Application at >
> {'Application': <Application at >, 'ZGlobals': <BTrees._OOBTree.OOBTree 
> object at 0xb242989c>}
> 2007-06-01 20:23:41 INFO ZPublisher.Conflict ConflictError at 
> /uniben/campus/students/A923157/study_course/create_level: database 
> conflict error (oid 0x36c429, class BTrees._OOBTree.OOBTree, serial this 
> txn started with 0x036e0590d58661ee 2007-06-01 17:52:50.044906, serial 
> currently committed 0x036e059346ef95dd 2007-06-01 17:55:16.625597) (1 
> conflicts (0 unresolved) since startup at Fri Jun  1 19:54:43 2007)
> 
> 
>> A longer term solution might be to come up with a derived index type
>> which used non-persistent objects (rather than the IITreeSet used by
>> UnIndex) for the set of RIDs stored under each 'minute':  you could then
>> inspect the state and do more aggressive conflict resolution than the
>> stock implementation allows (see my other post).
> 
> any other shortterm suggestions.

QueueCatalog?


Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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